Prushka, adoptive daughter of the White Whistle delver Bondrewd, shapes the narrative through transformative relationships and sacrifice. Named "flower of dawn" by Bondrewd following her rescue from the Abyss’ curse in the 5th Layer, her survival left lasting physical marks—permanently curled hair and a partially missing right ear. Bondrewd’s gift of Meinya, a small creature she tenderly nurtured, aided her recovery from psychological wounds.

Initially withdrawn and haunted by panic attacks, Prushka blossomed into a spirited, inquisitive soul, balancing fierce loyalty to Bondrewd with a yearning to explore beyond Idofront. Her fleeting but profound bond with Riko ignited mutual dreams of Abyss exploration, culminating in Prushka’s choice to become a Cartridge—absorbing the Abyss’ curse to grant Bondrewd its blessing. Her selfless act transformed her remains into a Life Reverberating Stone, later crafted by Riko into a White Whistle.

Persisting as a conscious entity within the whistle, Prushka bridges realms to guide Riko’s group, awakening ancient relics and amplifying Reg’s strength in pivotal battles. She communicates through subconscious echoes, retaining awareness of sensory experiences like tasting food vicariously. Her whistle later proves vital in confronting formidable foes, echoing her enduring legacy.

Prushka’s design—a green coat, gloves, and lantern-adorned hat—inspires her whistle’s form, mirroring Riko’s idealized adventurer imagery. Her arc intertwines resilience, fractured kinship, and sacrificial love, themes echoed in the song "Prushka" by indigo la End, which immortalizes her narrative within the series’ mythos.